Inconsistency diet structure level and nature of productivity , low biological usefulness of forages play a key role in the development of this disease. Older individuals usually marked osteoporosis — bone loss due to the predominance of the processes of absorption processes of osteogenesis . Characterized by bone fragility , poor healing of fractures. Osteodystrophy begin with perversion of appetite, hair loss , loss of productivity . Animals with the feeling worried Maklok , buttocks , metatarsals and pasterns .